That is impressive work by the specialists at Oberschleissheim. Since a few years they have a He-111B in restoration built under license by spanish manufacturer CASA in the early 1950s. As seen in the picture the center wing box is already connected to the fuselage by use of only 4(!) bolts. Furthermore the installation of the cockpit section and the portside engine is being prepared. One day the aircraft will enrich the exhibition of historical aircraft.